Low QRS voltage

(Redirected from Low voltage)
Jump to navigation Jump to search

WikiDoc Resources for Low QRS voltage


Most recent articles on Low QRS voltage

Most cited articles on Low QRS voltage

Review articles on Low QRS voltage

Articles on Low QRS voltage in N Eng J Med, Lancet, BMJ


Powerpoint slides on Low QRS voltage

Images of Low QRS voltage

Photos of Low QRS voltage

Podcasts & MP3s on Low QRS voltage

Videos on Low QRS voltage

Evidence Based Medicine

Cochrane Collaboration on Low QRS voltage

Bandolier on Low QRS voltage

TRIP on Low QRS voltage

Clinical Trials

Ongoing Trials on Low QRS voltage at Clinical Trials.gov

Trial results on Low QRS voltage

Clinical Trials on Low QRS voltage at Google

Guidelines / Policies / Govt

US National Guidelines Clearinghouse on Low QRS voltage

NICE Guidance on Low QRS voltage


FDA on Low QRS voltage

CDC on Low QRS voltage


Books on Low QRS voltage


Low QRS voltage in the news

Be alerted to news on Low QRS voltage

News trends on Low QRS voltage


Blogs on Low QRS voltage


Definitions of Low QRS voltage

Patient Resources / Community

Patient resources on Low QRS voltage

Discussion groups on Low QRS voltage

Patient Handouts on Low QRS voltage

Directions to Hospitals Treating Low QRS voltage

Risk calculators and risk factors for Low QRS voltage

Healthcare Provider Resources

Symptoms of Low QRS voltage

Causes & Risk Factors for Low QRS voltage

Diagnostic studies for Low QRS voltage

Treatment of Low QRS voltage

Continuing Medical Education (CME)

CME Programs on Low QRS voltage


Low QRS voltage en Espanol

Low QRS voltage en Francais


Low QRS voltage in the Marketplace

Patents on Low QRS voltage

Experimental / Informatics

List of terms related to Low QRS voltage

Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]

Synonyms and keywords: low volts; low voltage; low QRS; reduced voltage; Reduced QRS voltage; low voltage QRS complexes; diminished QRS; diminished QRS voltage; diminished voltage; Low amplitude QRS complexes; low voltage on the EKG; low volts


Low QRS voltage is a non-specific electrocardiographic finding in which the voltage (the height) of the QRS complexes is reduced.

Definitions of Low QRS Voltage:

  • If the total amplitude above and below the isoelectric line is < 5 mm in all 3 standard leads.
  • An average voltage in the limb leads of < 5 mm with an average of < 10 mm in the chest leads.
  • Should be at least 5 mm in V1 and V6 , 7 mm in V2 and V5 and 9 mm in V3 and V4.

Pathophysiology of Low QRS Voltage

Low voltage on the ECG tracing generally comes from either Low Power within the myocardium or Low Conduction from the heart to the ECG leads. There are three general processes that contribute to low QRS voltage:

  1. Damping of the electrical signal due to excess air (emphysema, COPD), fluid (pericardial effusion, pericardial constriction, pleural effusion), edema (anasarca), fat (obesity), or amyloid cardiomyopathy
  2. Electrically inert myocardium due to a loss of viable myocardium such as in myocardial infarction and Chagas disease]]
  3. Infiltration of the myocardium (myxedematous, Chagas disease)

Causes of Low QRS Voltage

The presence of low voltage on the EKG should prompt an evaluation to rule out life threatening emergencies such as cardiac tamponade or a large pericardial effusion. These two diagnoses are suggested by the presence of tachycardia and electrical alternans along with the low QRS voltage. In alphabetical order the differential diagnosis includes[1]:

Electrocardiographic Examples


  1. Madias JE. Low QRS voltage and its causes. J Electrocardiol. 41 (6): 498-500. doi:10.1016/j.jelectrocard.2008.06.021 - Pubmed citation
  2. 2.0 2.1 Madias JE (2008). "Low QRS voltage and its causes". J Electrocardiol. 41 (6): 498–500. doi:10.1016/j.jelectrocard.2008.06.021. PMID 18804788.
  3. Chinitz JS, Cooper JM, Verdino RJ (2008). "Electrocardiogram voltage discordance: interpretation of low QRS voltage only in the limb leads". J Electrocardiol. 41 (4): 281–6. doi:10.1016/j.jelectrocard.2007.12.001. PMID 18353352.
  4. http://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=1&cad=rja&ved=0CCYQFjAA&url=http%3A%2F%2Fwww.medschool.lsuhsc.edu%2Femergency_medicine%2Fdocs%2FTop%2520Ten%2520(or%252011)%2520EKG%2520Killers.ppt&ei=PXJeUJ0xp9rRAbOOgagK&usg=AFQjCNGGRSrJfRVl3cMy5au0lnmpeaBRQA